selinux-refpolicy/policy/modules/kernel/kernel.te

policy_module(kernel, 1.21.1)

########################################
#
# Declarations
#

## <desc>
## <p>
## Disable kernel module loading.
## </p>
## </desc>
gen_bool(secure_mode_insmod, false)

# assertion related attributes
attribute can_load_kernmodule;
attribute can_receive_kernel_messages;
attribute can_dump_kernel;

neverallow ~can_load_kernmodule self:capability sys_module;

# domains with unconfined access to kernel resources
attribute kern_unconfined;

# regular entries in proc
attribute proc_type;

# sysctls
attribute sysctl_type;

role system_r;
role sysadm_r;
role staff_r;
role user_r;

# here until order dependence is fixed:
role unconfined_r;

ifdef(`enable_mls',`
	role secadm_r;
	role auditadm_r;
')

#
# kernel_t is the domain of kernel threads.
# It is also the target type when checking permissions in the system class.
#
type kernel_t, can_load_kernmodule;
domain_base_type(kernel_t)
mls_rangetrans_source(kernel_t)
role system_r types kernel_t;
sid kernel gen_context(system_u:system_r:kernel_t,mls_systemhigh)

#
# DebugFS
#

type debugfs_t;
files_mountpoint(debugfs_t)
fs_type(debugfs_t)
allow debugfs_t self:filesystem associate;
genfscon debugfs / gen_context(system_u:object_r:debugfs_t,s0)

#
# kvmFS
#

type kvmfs_t;
fs_type(kvmfs_t)
genfscon kvmfs / gen_context(system_u:object_r:kvmfs_t,s0)

#
# Procfs types
#

type proc_t, proc_type;
files_mountpoint(proc_t)
fs_type(proc_t)
genfscon proc / gen_context(system_u:object_r:proc_t,s0)
genfscon proc /sysvipc gen_context(system_u:object_r:proc_t,s0)

type proc_afs_t, proc_type;
genfscon proc /fs/openafs gen_context(system_u:object_r:proc_afs_t,s0)

# kernel message interface
type proc_kmsg_t, proc_type;
genfscon proc /kmsg gen_context(system_u:object_r:proc_kmsg_t,mls_systemhigh)
neverallow ~{ can_receive_kernel_messages kern_unconfined } proc_kmsg_t:file ~getattr;

# /proc kcore: inaccessible
type proc_kcore_t, proc_type;
neverallow ~{ can_dump_kernel kern_unconfined } proc_kcore_t:file ~getattr;
genfscon proc /kcore gen_context(system_u:object_r:proc_kcore_t,mls_systemhigh)

type proc_mdstat_t, proc_type;
genfscon proc /mdstat gen_context(system_u:object_r:proc_mdstat_t,s0)

type proc_net_t, proc_type;
genfscon proc /net gen_context(system_u:object_r:proc_net_t,s0)

type proc_xen_t, proc_type;
files_mountpoint(proc_xen_t)
genfscon proc /xen gen_context(system_u:object_r:proc_xen_t,s0)

#
# Sysctl types
#

# /proc/sys directory, base directory of sysctls
type sysctl_t, sysctl_type;
files_mountpoint(sysctl_t)
sid sysctl gen_context(system_u:object_r:sysctl_t,s0)
genfscon proc /sys gen_context(system_u:object_r:sysctl_t,s0)

# /proc/irq directory and files
type sysctl_irq_t, sysctl_type;
genfscon proc /irq gen_context(system_u:object_r:sysctl_irq_t,s0)

# /proc/net/rpc directory and files
type sysctl_rpc_t, sysctl_type;
genfscon proc /net/rpc gen_context(system_u:object_r:sysctl_rpc_t,s0)

# /proc/sys/crypto directory and files
type sysctl_crypto_t, sysctl_type;
genfscon proc /sys/crypto gen_context(system_u:object_r:sysctl_crypto_t,s0)

# /proc/sys/fs directory and files
type sysctl_fs_t, sysctl_type;
files_mountpoint(sysctl_fs_t)
genfscon proc /sys/fs gen_context(system_u:object_r:sysctl_fs_t,s0)

# /proc/sys/kernel directory and files
type sysctl_kernel_t, sysctl_type;
genfscon proc /sys/kernel gen_context(system_u:object_r:sysctl_kernel_t,s0)

# /proc/sys/kernel/modprobe file
type sysctl_modprobe_t, sysctl_type;
genfscon proc /sys/kernel/modprobe gen_context(system_u:object_r:sysctl_modprobe_t,s0)

# /proc/sys/kernel/hotplug file
type sysctl_hotplug_t, sysctl_type;
genfscon proc /sys/kernel/hotplug gen_context(system_u:object_r:sysctl_hotplug_t,s0)

# /proc/sys/net directory and files
type sysctl_net_t, sysctl_type;
genfscon proc /sys/net gen_context(system_u:object_r:sysctl_net_t,s0)

# /proc/sys/net/unix directory and files
type sysctl_net_unix_t, sysctl_type;
genfscon proc /sys/net/unix gen_context(system_u:object_r:sysctl_net_unix_t,s0)

# /proc/sys/vm directory and files
type sysctl_vm_t, sysctl_type;
genfscon proc /sys/vm gen_context(system_u:object_r:sysctl_vm_t,s0)

type sysctl_vm_overcommit_t, sysctl_type;
genfscon proc /sys/vm/overcommit_memory gen_context(system_u:object_r:sysctl_vm_overcommit_t,s0)

# /proc/sys/dev directory and files
type sysctl_dev_t, sysctl_type;
genfscon proc /sys/dev gen_context(system_u:object_r:sysctl_dev_t,s0)

#
# unlabeled_t is the type of unlabeled objects.
# Objects that have no known labeling information or that
# have labels that are no longer valid are treated as having this type.
#
# Mountpoint permissions are for the case when a file has been assigned
# an extended attribute for the first time (old file_t).  Directories
# where filesystems are mounted may never get relabeled.
#
type unlabeled_t alias file_t;
kernel_rootfs_mountpoint(unlabeled_t)
files_mountpoint(unlabeled_t)
fs_associate(unlabeled_t)
sid file gen_context(system_u:object_r:unlabeled_t,s0)
sid unlabeled gen_context(system_u:object_r:unlabeled_t,mls_systemhigh)
neverallow * unlabeled_t:file entrypoint;

# These initial sids are no longer used, and can be removed:
sid any_socket		gen_context(system_u:object_r:unlabeled_t,mls_systemhigh)
sid file_labels		gen_context(system_u:object_r:unlabeled_t,s0)
sid icmp_socket		gen_context(system_u:object_r:unlabeled_t,mls_systemhigh)
sid igmp_packet		gen_context(system_u:object_r:unlabeled_t,mls_systemhigh)
sid init		gen_context(system_u:object_r:unlabeled_t,s0)
sid kmod		gen_context(system_u:object_r:unlabeled_t,mls_systemhigh)
sid policy		gen_context(system_u:object_r:unlabeled_t,mls_systemhigh)
sid scmp_packet		gen_context(system_u:object_r:unlabeled_t,mls_systemhigh)
sid sysctl_modprobe 	gen_context(system_u:object_r:unlabeled_t,s0)
sid sysctl_fs		gen_context(system_u:object_r:unlabeled_t,s0)
sid sysctl_kernel	gen_context(system_u:object_r:unlabeled_t,s0)
sid sysctl_net		gen_context(system_u:object_r:unlabeled_t,s0)
sid sysctl_net_unix	gen_context(system_u:object_r:unlabeled_t,s0)
sid sysctl_vm		gen_context(system_u:object_r:unlabeled_t,s0)
sid sysctl_dev		gen_context(system_u:object_r:unlabeled_t,s0)
sid tcp_socket		gen_context(system_u:object_r:unlabeled_t,mls_systemhigh)

########################################
#
# kernel local policy
#

allow kernel_t self:capability ~sys_module;
allow kernel_t self:process ~{ ptrace setcurrent setexec setfscreate setrlimit execmem execstack execheap };
allow kernel_t self:shm create_shm_perms;
allow kernel_t self:sem create_sem_perms;
allow kernel_t self:msg { send receive };
allow kernel_t self:msgq create_msgq_perms;
allow kernel_t self:unix_dgram_socket create_socket_perms;
allow kernel_t self:unix_stream_socket create_stream_socket_perms;
allow kernel_t self:unix_dgram_socket sendto;
allow kernel_t self:unix_stream_socket connectto;
allow kernel_t self:fifo_file rw_fifo_file_perms;
allow kernel_t self:sock_file read_sock_file_perms;
allow kernel_t self:fd use;

allow kernel_t debugfs_t:dir search_dir_perms;

allow kernel_t proc_t:dir list_dir_perms;
allow kernel_t proc_t:file read_file_perms;
allow kernel_t proc_t:lnk_file read_lnk_file_perms;

allow kernel_t proc_net_t:dir list_dir_perms;
allow kernel_t proc_net_t:file read_file_perms;

allow kernel_t proc_mdstat_t:file read_file_perms;

allow kernel_t proc_kcore_t:file getattr;

allow kernel_t proc_kmsg_t:file getattr;

allow kernel_t sysctl_kernel_t:dir list_dir_perms;
allow kernel_t sysctl_kernel_t:file read_file_perms;
allow kernel_t sysctl_t:dir list_dir_perms;

# Other possible mount points for the root fs are in files
allow kernel_t unlabeled_t:dir mounton;
# Kernel-generated traffic e.g., TCP resets on
# connections with invalidated labels:
allow kernel_t unlabeled_t:packet send;

kernel_request_load_module(kernel_t)

# Allow unlabeled network traffic
allow unlabeled_t unlabeled_t:packet { forward_in forward_out };
corenet_in_generic_if(unlabeled_t)
corenet_in_generic_node(unlabeled_t)

corenet_all_recvfrom_unlabeled(kernel_t)
corenet_all_recvfrom_netlabel(kernel_t)
# Kernel-generated traffic e.g., ICMP replies:
corenet_raw_sendrecv_all_if(kernel_t)
corenet_raw_sendrecv_all_nodes(kernel_t)
corenet_raw_send_generic_if(kernel_t)
# Kernel-generated traffic e.g., TCP resets:
corenet_tcp_sendrecv_all_if(kernel_t)
corenet_tcp_sendrecv_all_nodes(kernel_t)
corenet_raw_send_generic_node(kernel_t)
corenet_send_all_packets(kernel_t)

dev_read_sysfs(kernel_t)
dev_search_usbfs(kernel_t)
# devtmpfs handling:
dev_create_generic_dirs(kernel_t)
dev_delete_generic_dirs(kernel_t)
dev_create_generic_blk_files(kernel_t)
dev_delete_generic_blk_files(kernel_t)
dev_create_generic_chr_files(kernel_t)
dev_delete_generic_chr_files(kernel_t)
dev_mounton(kernel_t)

# Mount root file system. Used when loading a policy
# from initrd, then mounting the root filesystem
fs_mount_all_fs(kernel_t)
fs_unmount_all_fs(kernel_t)

selinux_load_policy(kernel_t)

term_use_console(kernel_t)

# for kdevtmpfs
term_setattr_unlink_unallocated_ttys(kernel_t)

corecmd_exec_shell(kernel_t)
corecmd_list_bin(kernel_t)
# /proc/sys/kernel/modprobe is set to /bin/true if not using modules.
corecmd_exec_bin(kernel_t)

domain_signal_all_domains(kernel_t)
domain_search_all_domains_state(kernel_t)

files_list_root(kernel_t)
files_list_etc(kernel_t)
files_list_home(kernel_t)
files_read_usr_files(kernel_t)

mcs_process_set_categories(kernel_t)

mls_process_read_all_levels(kernel_t)
mls_process_write_all_levels(kernel_t)
mls_file_write_all_levels(kernel_t)
mls_file_read_all_levels(kernel_t)

ifdef(`distro_redhat',`
	# Bugzilla 222337
	fs_rw_tmpfs_chr_files(kernel_t)
')

ifdef(`init_systemd',`
	optional_policy(`
		dev_manage_input_dev(kernel_t)
		dev_filetrans_input_dev(kernel_t)
	')

	optional_policy(`
		selinux_compute_create_context(kernel_t)
	')

	optional_policy(`
		storage_dev_filetrans_fixed_disk(kernel_t)
		storage_setattr_fixed_disk_dev(kernel_t)
		storage_create_fixed_disk_dev(kernel_t)
		storage_delete_fixed_disk_dev(kernel_t)
	')
')

optional_policy(`
	# loop devices
	fstools_use_fds(kernel_t)
')

optional_policy(`
	hotplug_search_config(kernel_t)
')

optional_policy(`
	init_sigchld(kernel_t)
')

optional_policy(`
	libs_use_ld_so(kernel_t)
	libs_use_shared_libs(kernel_t)
')

optional_policy(`
	logging_send_syslog_msg(kernel_t)
')

optional_policy(`
	mount_use_fds(kernel_t)
	mount_read_loopback_files(kernel_t)
')

optional_policy(`
	nis_use_ypbind(kernel_t)
')

optional_policy(`
	# nfs kernel server needs kernel UDP access. It is less risky and painful
	# to just give it everything.
	allow kernel_t self:tcp_socket create_stream_socket_perms;
	allow kernel_t self:udp_socket create_socket_perms;

	# nfs kernel server needs kernel UDP access. It is less risky and painful
	# to just give it everything.
	corenet_udp_sendrecv_generic_if(kernel_t)
	corenet_udp_sendrecv_generic_node(kernel_t)
	corenet_udp_sendrecv_all_ports(kernel_t)
	corenet_udp_bind_generic_node(kernel_t)
	corenet_sendrecv_portmap_client_packets(kernel_t)
	corenet_sendrecv_generic_server_packets(kernel_t)

	fs_getattr_xattr_fs(kernel_t)

	auth_dontaudit_getattr_shadow(kernel_t)

	sysnet_read_config(kernel_t)

	rpc_manage_nfs_ro_content(kernel_t)
	rpc_manage_nfs_rw_content(kernel_t)
	rpc_tcp_rw_nfs_sockets(kernel_t)
	rpc_udp_rw_nfs_sockets(kernel_t)

	tunable_policy(`nfs_export_all_ro',`
		fs_getattr_noxattr_fs(kernel_t)
		fs_list_noxattr_fs(kernel_t)
		fs_read_noxattr_fs_files(kernel_t)
		fs_read_noxattr_fs_symlinks(kernel_t)

		files_list_non_auth_dirs(kernel_t)
		files_read_non_auth_files(kernel_t)
		files_read_non_auth_symlinks(kernel_t)
	')

	tunable_policy(`nfs_export_all_rw',`
		fs_getattr_noxattr_fs(kernel_t)
		fs_list_noxattr_fs(kernel_t)
		fs_read_noxattr_fs_files(kernel_t)
		fs_read_noxattr_fs_symlinks(kernel_t)

		files_manage_non_auth_files(kernel_t)
	')
')

optional_policy(`
	seutil_read_config(kernel_t)
	seutil_read_bin_policy(kernel_t)
')

optional_policy(`
	unconfined_domain_noaudit(kernel_t)
')

########################################
#
# Unlabeled process local policy
#

optional_policy(`
	# If you load a new policy that removes active domains, processes can
	# get stuck if you do not allow unlabeled processes to signal init.
	# If you load an incompatible policy, you should probably reboot,
	# since you may have compromised system security.
	init_sigchld(unlabeled_t)
')

########################################
#
# Kernel module loading policy
#

if( ! secure_mode_insmod ) {
	allow can_load_kernmodule self:capability sys_module;

	files_load_kernel_modules(can_load_kernmodule)

	# load_module() calls stop_machine() which
	# calls sched_setscheduler()
	# gt: there seems to be no trace of the above, at
	# least in kernel versions greater than 2.6.37...
	allow can_load_kernmodule self:capability sys_nice;
	kernel_setsched(can_load_kernmodule)
}

########################################
#
# Rules for unconfined acccess to this module
#

allow kern_unconfined proc_type:{ dir lnk_file } *;
allow kern_unconfined proc_type:file ~{ execmod entrypoint };

allow kern_unconfined sysctl_type:dir *;
allow kern_unconfined sysctl_type:file ~{ execmod entrypoint };

allow kern_unconfined kernel_t:system *;

allow kern_unconfined unlabeled_t:{ file chr_file } ~{ entrypoint execmod };
allow kern_unconfined unlabeled_t:{ dir lnk_file sock_file fifo_file blk_file } *;
allow kern_unconfined unlabeled_t:filesystem *;
allow kern_unconfined unlabeled_t:association *;
allow kern_unconfined unlabeled_t:packet *;
allow kern_unconfined unlabeled_t:process ~{ transition dyntransition execmem execstack execheap };